Search for the lightest scalar top quark in events with two leptons in ppbar collisions at sqrt(s)=1.96 TeV

TL;DR

This paper reports a search for the lightest scalar top quark in proton-antiproton collisions at 1.96 TeV, using 1 fb-1 of data, but finds no evidence and sets exclusion limits within the MSSM framework.

Contribution

First search for scalar top quark pair production in dilepton final states at the Tevatron with new exclusion limits.

Findings

No evidence for scalar top quark production.

Excluded regions of parameter space in the MSSM.

Set limits based on 1 fb-1 of data.

Abstract

We report results of a search for the pair production of the lightest supersymmetric partner of the top quark using 1 fb-1 of data collected by the D0 detector at a ppbar center-of-mass energy of 1.96 TeV at the Fermilab Tevatron Collider. Both scalar top quarks are assumed to decay into a b quark, a charged lepton and a scalar neutrino. The search is performed in the electron plus muon and dielectron final states. The signal topology consists of two isolated leptons, missing transverse energy, and jets. We find no evidence for this process and exclude regions of parameter space in the framework of the minimal supersymmetric standard model.